/Engine/Source/Editor/StatsViewer/Public/IStatsPage.h
Get custom widget to display in the top part of the stats viewer, can return nullptr
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > GetCustomWidget ( [TWeakPtr](API\Runtime\Core\Templates\TWeakPtr)< class [IStatsViewer](API\Editor\StatsViewer\IStatsViewer) > InParentStatsViewer )